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Environmental Engineering

Environmental Engineering
The design discharge for the combined sewer system shall be taken as

Rainfall + 6 DWF
Rainfall + DWF
Rainfall + 2 DWF
Equal to rainfall

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Environmental Engineering
When there is no recirculation of sewage, then recirculation factor is

Infinity
1
None of these

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Environmental Engineering
As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is

None of these
Smaller
Larger
Same

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Environmental Engineering
The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is

Separate system
Combined system
Partially combined system
Partially separate system

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Environmental Engineering
Chlorine demand of water is equal to

Sum of applied and residual chlorine
Difference of applied and residual chlorine
Applied chlorine
Residual chlorine

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Environmental Engineering
If the sewage contains grease and fatty oils, these are removed in

Sedimentation tanks
Skimming tanks
Grit chambers
Detritus tanks

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